Question

1) explain why plants need carbon, hydrogen, oxygen and nitrogen to make food.

2) how is it possible to conclude that chlorophyll has something to do with using light energy?

3) it has been assumed that oxygen is gained from either carbon dioxide or water. Where else could the oxygen come from?​

Answer 1

1. explain why plants need carbon, hydrogen, oxygen and nitrogen to make food.

During the day (or artificial light at night), plants absorb carbon dioxide from the atmosphere and release oxygen. Nitrogen – Like carbon, hydrogen and oxygen, all living beings also need nitrogen to make proteins. Even though air consists of about 80% nitrogen, it cannot be used by plants directly as gas.